Both the banks and Coinstar tell us they have their own team of inspectors who regularly test and calibrate the kiosks.

All the companies say they will work with any customer who believes they've been shorted.

Statement from TD Bank:

We pride ourselves on being the Human Bank - placing our customers at the center of everything we do...We maintain all of our Penny Arcade coin counters on a regular basis throughout the day, from cleaning and calibrating the machines...

TD Bank also provided the following tips for using their Penny Arcade:-Make sure your change is free of lint and dust-Penny will count any U.S. coin except for the Eisenhower dollar or silver coin dollars-Consistently add coins into the counter after you begin. If there is a lapse in time, the counter may complete the transaction sooner than you intended. If this occurs, Penny will give you a receipt , and the next time you add coins it will go towards new total-Questions or concerns can be addressed by a TD Bank representative

Statement from Coinstar:

Its number one goal is to provide its customers with a satisfying and reliable experience...it has refined technology and implemented regular maintenance schedules to service, clean, calibrate and test the machines to ensure reliability and high accuracy levels...rigorous testing has delivered extremely accurate coin counting and more than 95% machine uptime.

Statement from PNC Bank:

PNC says its coin counters are calibrated and inspected twice per year to ensure that all key components are functioning properly. On an ongoing and regular basis, the individual locations maintain, clean and perform the basic upkeep of the machines that may be required. The individual locations also have the machines serviced if they become aware of any functionality issues.